|
The Paleozoic era (541-252 mya) was the "Age of ____".
|
Cenozoic
|
|
The ____ preceded the Paleozoic, Mesozoic, and Cenozoic eras.
|
Earth
|
|
____ formed about 4.5 billion years ago.
|
Ice Age
|
|
The last ____ occurred about 26,500-11,700 years ago.
|
Mesozoic
|
|
The ____ era began after a huge asteroid hit Earth 66 mya.
|
Plesiosaurs
|
|
____ were marine reptiles, not dinosaurs.
|
Precambrian
|
|
____ were saber-toothed, tiger-like mammals of the Ice Age.
|
Smilodons
|
|
Triassic, Jurassic, and Cretaceous are periods of the ____ era.
|
Trilobites
|
